Why not just leave that battery in place, and start your rig up about once a Month?
I try to drive my rig about 20 miles each winter month. Usually run the generator and an electric space heater while doing so. In addition to keeping the batteries (coach and house) charged it keeps the brakes and generator from rusting and the various driveline seals lubed. If starting/driving was not possible I might take all the batteries out so I could leave them on a battery tender. It likely would cause the engine computer (and the radio!) to lose its memory but it won’t be a problem. The engine and transmission computers will just go back to default settings and re-learn when put back in service. Good luck!
my 2016 Axis will be dead in 2 weeks know matter the time of year. been that way since new. after 3 times of this happening as soon as i am through using it i disconnect +&- post from battery.end of dead battery. never had to charge it again.Thor didn't know what was wrong. coach batteries have been fine.